5 mass flow functions (basic or detailed setup) – Yokogawa RotaMASS 3-Series User Manual

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7. pArAMETEr dESCrIpTION

7-83

IM 01R04B04-00E-E 8th edition March 01, 2011 -00

7.5 Mass flow functions (Basic or detailed Setup)

Mass flow

To set the functions of mass flow measurement.

Mass flow unit

Select:

g/s, g/min, g/h, kg/s, kg/min, kg/h, kg/d, t/min, t/h, t/d, lb/s,

lb/min, lb/h, lb/d

Mass flow format

Select:

xxxxxxx,xxxxx.X, xxxx.XX, xxx.XXX, xx.XXXX, x.XXXXX

Mass flow lrv
(low range value)

Set a mass flow value to the 4 mA or 0 Hz. LRV can also be negative to
measure reverse flow.

Mass flow Urv
(upper range value)

Set a mass flow value to the 20 mA or xxxxxHz.
Abs(URV-LRV) ≥ 5% of Qnom for liquids (1% for gases)

Mass flow damping

Set the damping time in s. Damping time affects outputs and display.
After 5 times damping time the given value is displayed (t=63%).

Mass flow lowcut

Set the low cut. Low cut affects outputs and display and applies to
negative and positive flow. A hysteresis of 0.05% of Qnom is given by
the system.

Mass flow alm 1 sel

Select:

No function, More than, less than

Mass flow alm 1 crit

Select a mass flow alarm level. What happens in case of an alarm has
to be defined in Status out (7.12, 7.13).

Mass flow alm 2 sel

Select:

No function, More than, less than

Mass flow alm 2 sel
Restrictions:
All alarms have to be in 0-110%
of URV-LRV.
Alarm criteria 2 must always be
larger than alarm criteria 1.

Select a mass flow alarm level. What happens in case of an alarm has
to be defined in Status out (7.12, 7.13).

Mass flow fix val sel

Select:

Inhibit, Enable

Mass flow fixed value

Select a fix Mass flow value (only for test purpose or in case of
maintenance).
The set value is added to the actual value. In case of no flow it will vary
with the zero fluctuation.